期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 223, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2020.110956
关键词
Phase change material; Form-stable phase change material; Thermal energy storage; Porous ceramics; Thermal conductivity enhancement
资金
- NSERC
- Walter Sumner Foundation
- Clean Technology Research Institute at Dalhousie University
In this study, a wide variety of form-stable phase change materials were prepared using different freeze-cast matrices and PCMs, achieving enhanced thermal conductivity and mechanical stability. Alumina showed the best performance in terms of thermal conductivity at a 38% mass loading, while chitosan and carbonized chitosan scaffolds exhibited the highest PCM loading up to 95%.
Form-stable phase change materials (PCMs) can provide containerless thermal energy storage with enhanced thermal conductivity relative to the pure PCMs. In the present work, the use of many different freeze-cast matrices (alumina, titania, carbon black, alumina/carbon black, chitosan, carbonized chitosan) is explored with many different PCMs (fatty acids, PEG, paraffin, esters, sugar alcohols, salt hydrates), to prepare a wide variety of form-stable phase change materials, using commodity materials. Materials were characterized by density, PCM fill, phase transition characteristics (melting point, enthalpy of fusion) including after melt-freeze cycling up to 1000 times, morphology (SEM), thermal conductivity and Vicker's hardness. The matrix did not substantially influence the PCM melting points, but did control the fill, thermal conductivity and mechanical properties of the form-stable PCMs. Alumina at a 38 mass% loading of PCM gave the best thermal conductivity, up to 3.2 W m(-1) K-1, significantly enhanced compared with 0.15 W m(-1) K-1 for the pure PCM, and with excellent hardness and mechanical stability after 1000 cycles. Chitosan and carbonized chitosan scaffolds gave form-stable PCMs with the highest PCM loading, up to 95 mass%.
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